Stores 36 ¼" driver bits or 27 bits and an extension. This insert fits a 2x3x3 Double Lip Corrugated Gridfinity Light bin by ImprovedByDesign (reupload included for convenience). Print both and they snap together easily. No need to reprint the whole bin if you make a change! I remixed ImprovedByDesign's work by adding the slots for bits.

Recommend printing with 0.4mm nozzle and face-down on the build plate. No supports needed, especially if you print with one wall. Looks great if you print the insert and bin in different colors! If you want to keep the bits from sliding forward and back, also print the stop blocks and glue them in place with superglue.